president obama is about to begin his second term and security for the inaugural ceremonies on monday will, of course, be extremely tight. uniform police will be everywhere, but we asked john miller to tell us about the security operations that you won't see. >> i, barack hussein obama do solemnly swear -- >> reporter: during president obama's first inauguration there was a threat taken so seriously that counterterrorism agents seemed to be everywhere in the crowd of two million. in east africa, people were taken into custody and given lie detector tests by the f.b.i. in tend, the tip turned out to be wrong but it gave a young administration on its very first day a picture of what can go on behind the scenes of a major event. for this inauguration, some of the security is meant to be obvious: the coast guard will shut down the potomac river, but some of the security is meant to be nearly invisible. at union station who two men who could have been waiting for a train were actually d.h.s. behavioral detection officers who blend in with the crowd. trained to look for suspicious behavior